Fixed dbuf variable scope in luaRedisGenericCommand().

I'm not sure if while the visibility is the inner block, the fact we
point to 'dbuf' is a problem or not, probably the stack var isx
guaranteed to live until the function returns. However obvious code is
better anyway.

src/scripting.c

@@ -232,11 +232,11 @@ int luaRedisGenericCommand(lua_State *lua, int raise_error) {
     for (j = 0; j < argc; j++) {
         char *obj_s;
         size_t obj_len;
+        char dbuf[64];
 
         if (lua_isnumber(lua,j+1)) {
             /* We can't use lua_tolstring() for number -> string conversion
              * since Lua uses a format specifier that loses precision. */
-            char dbuf[64];
             lua_Number num = lua_tonumber(lua,j+1);
 
             obj_len = snprintf(dbuf,sizeof(dbuf),"%.17g",(double)num);